Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash flows from operating activities
Net loss		$ (26,497,000)	$ (13,890,000)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization		1,602,000	373,000
Impairment of long-lived assets	$ 2,914,000	5,784,000		$ 0
Stock-based compensation expense		1,581,000	2,789,000
Write-off lease receivable/prepaid commission assets		1,383,000
Changes in assets and liabilities
Prepaid expenses and other assets		962,000	(2,892,000)
Accounts payable		615,000	1,938,000
Deferred revenue			(146,000)
Accrued and other liabilities		(1,823,000)	(181,000)
Net cash used in operating activities		(16,393,000)	(12,009,000)
Cash flows from financing activities
Proceeds from issuance of common stock in connection with employee benefit plans		311,000	14,000
Proceeds from issuance of common stock in private placement		4,922,000
Net cash provided by financing activities		5,233,000	14,000
Net change in cash, cash equivalents, and restricted cash		(11,160,000)	(11,995,000)
Cash, cash equivalents, and restricted cash at beginning of period		67,557,000	59,388,000	59,388,000
Cash, cash equivalents, and restricted cash at end of period	$ 56,397,000	$ 56,397,000	$ 47,393,000	$ 67,557,000